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dm: switch dm_io booleans over to proper flags 

Add flags to dm_io and manage them using the same pattern used for
bi_flags in struct bio.

Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Mike Snitzer 2022-03-18 00:15:28 -04:00
parent e9567332a4
commit 82f6cdcc36
2 changed files with 38 additions and 14 deletions
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22
drivers/md/dm-core.h
View File

@ -232,18 +232,36 @@ struct dm_io {
struct mapped_device *md;
struct bio *orig_bio;
blk_status_t status;
bool start_io_acct:1;
int was_accounted;
unsigned short flags;
unsigned long start_time;
void *data;
struct hlist_node node;
struct task_struct *map_task;
spinlock_t startio_lock;
spinlock_t endio_lock;
struct dm_stats_aux stats_aux;
/* last member of dm_target_io is 'struct bio' */
struct dm_target_io tio;
};
/*
* dm_io flags
*/
enum {
DM_IO_START_ACCT,
DM_IO_ACCOUNTED
};
static inline bool dm_io_flagged(struct dm_io *io, unsigned int bit)
{
return (io->flags & (1U << bit)) != 0;
}
static inline void dm_io_set_flag(struct dm_io *io, unsigned int bit)
{
io->flags |= (1U << bit);
}
static inline void dm_io_inc_pending(struct dm_io *io)
{
atomic_inc(&io->io_count);

30
drivers/md/dm.c
View File

@ -541,11 +541,18 @@ static void dm_start_io_acct(struct dm_io *io, struct bio *clone)
* Expect no possibility for race unless is_duplicate_bio.
*/
if (!clone || likely(!clone_to_tio(clone)->is_duplicate_bio)) {
if (WARN_ON_ONCE(io->was_accounted))
if (WARN_ON_ONCE(dm_io_flagged(io, DM_IO_ACCOUNTED)))
return;
io->was_accounted = 1;
} else if (xchg(&io->was_accounted, 1) == 1)
return;
dm_io_set_flag(io, DM_IO_ACCOUNTED);
} else {
unsigned long flags;
if (dm_io_flagged(io, DM_IO_ACCOUNTED))
return;
/* Can afford locking given is_duplicate_bio */
spin_lock_irqsave(&io->startio_lock, flags);
dm_io_set_flag(io, DM_IO_ACCOUNTED);
spin_unlock_irqrestore(&io->startio_lock, flags);
}
__dm_start_io_acct(io, bio);
}
@ -575,11 +582,10 @@ static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio)
io->orig_bio = NULL;
io->md = md;
io->map_task = current;
spin_lock_init(&io->startio_lock);
spin_lock_init(&io->endio_lock);
io->start_time = jiffies;
io->start_io_acct = false;
io->was_accounted = 0;
io->flags = 0;
dm_stats_record_start(&md->stats, &io->stats_aux);
@ -868,7 +874,7 @@ static void dm_io_complete(struct dm_io *io)
}
io_error = io->status;
if (io->was_accounted)
if (dm_io_flagged(io, DM_IO_ACCOUNTED))
dm_end_io_acct(io, bio);
else if (!io_error) {
/*
@ -1218,7 +1224,7 @@ void dm_submit_bio_remap(struct bio *clone, struct bio *tgt_clone)
*/
if (io->map_task == current) {
/* Still in target's map function */
io->start_io_acct = true;
dm_io_set_flag(io, DM_IO_START_ACCT);
} else {
/*
* Called by another thread, managed by DM target,
@ -1288,7 +1294,7 @@ static void __map_bio(struct bio *clone)
case DM_MAPIO_SUBMITTED:
/* target has assumed ownership of this io */
if (!ti->accounts_remapped_io)
io->start_io_acct = true;
dm_io_set_flag(io, DM_IO_START_ACCT);
break;
case DM_MAPIO_REMAPPED:
/*
@ -1297,7 +1303,7 @@ static void __map_bio(struct bio *clone)
*/
__dm_submit_bio_remap(clone, disk_devt(io->md->disk),
tio->old_sector);
io->start_io_acct = true;
dm_io_set_flag(io, DM_IO_START_ACCT);
break;
case DM_MAPIO_KILL:
case DM_MAPIO_REQUEUE:
@ -1591,7 +1597,7 @@ out:
if (!orig_bio)
orig_bio = bio;
smp_store_release(&ci.io->orig_bio, orig_bio);
if (ci.io->start_io_acct)
if (dm_io_flagged(ci.io, DM_IO_START_ACCT))
dm_start_io_acct(ci.io, NULL);
/*